Haskell One Liners

haskell_one_liners

-- Inspired by http://solog.co/47/10-scala-one-liners-to-impress-your-friends/

-- Double everything in a list
map (*2) [1..10]

-- Sum a list of numbers 
sum [1..1000]

-- Verify if exists in a string (thanks to hammar for this: http://stackoverflow.com/questions/6224315/how-to-verify-if-some-items-are-in-a-list)
any (`elem` ["haskell", "ghc", "monads", "cabal"]) $ words "this is a piece of example text talking about haskell and ghc"

-- read in a file
readFile "file.txt" >>= return . lines

-- Sing happy birthday
putStr "Who's the birthday boy then? > " >> getLine >>= (\name ->  mapM_ (\i -> putStrLn $ "Happy Birthday" ++ (if (i == 3) then " dear " ++ name else " to you!")) [1..4])

-- Filter/partiton a list of numbers 
partition (>60) [49, 58, 76, 82, 88, 90]

-- Fetch and Parse an XML web service

-- Find a minimum or maximum in a list
maximum [14, 35, -7, 46, 98]
minimum [14, 35, -7, 46, 98]